87 lines
1.8 KiB
JavaScript
87 lines
1.8 KiB
JavaScript
/**
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* @module ol/rotationconstraint
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*/
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import {toRadians} from './math.js';
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/**
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* @typedef {function((number|undefined), number): (number|undefined)} Type
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*/
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/**
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* @param {number|undefined} rotation Rotation.
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* @param {number} delta Delta.
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* @return {number|undefined} Rotation.
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*/
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export function disable(rotation, delta) {
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if (rotation !== undefined) {
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return 0;
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} else {
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return undefined;
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}
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}
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/**
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* @param {number|undefined} rotation Rotation.
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* @param {number} delta Delta.
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* @return {number|undefined} Rotation.
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*/
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export function none(rotation, delta) {
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if (rotation !== undefined) {
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return rotation + delta;
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} else {
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return undefined;
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}
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}
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/**
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* @param {number} n N.
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* @return {module:ol/rotationconstraint~Type} Rotation constraint.
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*/
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export function createSnapToN(n) {
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const theta = 2 * Math.PI / n;
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return (
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/**
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* @param {number|undefined} rotation Rotation.
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* @param {number} delta Delta.
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* @return {number|undefined} Rotation.
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*/
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function(rotation, delta) {
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if (rotation !== undefined) {
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rotation = Math.floor((rotation + delta) / theta + 0.5) * theta;
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return rotation;
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} else {
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return undefined;
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}
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});
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}
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/**
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* @param {number=} opt_tolerance Tolerance.
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* @return {module:ol/rotationconstraint~Type} Rotation constraint.
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*/
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export function createSnapToZero(opt_tolerance) {
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const tolerance = opt_tolerance || toRadians(5);
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return (
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/**
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* @param {number|undefined} rotation Rotation.
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* @param {number} delta Delta.
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* @return {number|undefined} Rotation.
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*/
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function(rotation, delta) {
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if (rotation !== undefined) {
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if (Math.abs(rotation + delta) <= tolerance) {
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return 0;
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} else {
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return rotation + delta;
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}
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} else {
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return undefined;
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}
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});
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}
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